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Theorem sltssn 28161
Description: Surreal set less-than of two singletons. (Contributed by Scott Fenton, 17-Mar-2025.)
Hypotheses
Ref Expression
sltssn.1 (𝜑 → 𝐴 ∈ No)
sltssn.2 (𝜑 → 𝐵 ∈ No)
sltssn.3 (𝜑 → 𝐴 <s 𝐵)
Assertion
Ref Expression
sltssn (𝜑 → {𝐴} <<s {𝐵})

Proof of Theorem sltssn
StepHypRef Expression
1 sltssn.3 . 2 (𝜑 → 𝐴 <s 𝐵)
2 sltssn.1 . . 3 (𝜑 → 𝐴 ∈ No)
3 sltssn.2 . . 3 (𝜑 → 𝐵 ∈ No)
42, 3sltssnb 28160 . 2 (𝜑 → ({𝐴} <<s {𝐵} ↔ 𝐴 <s 𝐵))
51, 4mpbird 260 1 (𝜑 → {𝐴} <<s {𝐵})
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∈ wcel 2144  {csn 4584   class class class wbr 5102  Nocsur 28002   <s clts 28003   <<s cslts 28148
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-ext 2732  ax-sep 5248  ax-pr 5390
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-sb 2099  df-clab 2739  df-cleq 2752  df-clel 2835  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-ss 3896  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-sn 4585  df-pr 4587  df-op 4835  df-br 5103  df-opab 5167  df-xp 5656  df-slts 28149
This theorem is used by:  cutneg  28207  zcuts  28798  twocut  28814  nohalf  28815  pw2recs  28829  halfcut  28849  addhalfcut  28850  pw2cut2  28853  bdaypw2n0bndlem  28854  bdayfinbndlem1  28858
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